I don't know what was going on with others' unit. But my 5GHz backhaul connected more than 72 hours with 160MHz and stable. Below is the stat:I upgraded last night and all was good. Woke up this morning and the node had reverted to 2.4ghz for backhaul. Speed on anything connected to the node was down to about 60 megs as opposed to the usual 500 (I'm on a 1gig connection). Rebooted, twice, no difference. Did a factory reset on the node and when set up again, it then went back to 5ghz backhaul and over 500 megs. That was about 6 hours ago so I'm keeping my fingers crossed it stays that way.